中文摘要：

利用SPCE061A单片机的片上资源,根据SPWM原理,以高级语言生成波形数据表格,以查表调用的方式提高了变频电源频率合成的速度和精度。电源具有较高的效率,实测表明该电源波形质量好,适合在地网接地电阻测量中应用。

英文摘要：

Based on the principle of SPWM,this paper discusses how to improve the rate and precision of frequency synthesis of variable-frequency power supply by utilizing resources on the chip of SPCE061A and generating waveform data form with advanced language and in lookup-calling form.The experimental results show that the power has high efficiency with good power waveform,which is suitable for grounding resistance measurement.